But the race isn't on St Davids Day lol, St Davids Day is March 1st.
If you're going to make a weekend of it, then we have weekly 5K time trials held every Saturday morning too.
Snowdon Marathon is quite a tough one so I've heard, I've not done it myself. Theres the Llanelli Half on 2 Mar also, which is well worth a go. Cardiff has it's Half in Oct, and there's even rumour that they might hold a Full mara again this year, probably on the same date as they did in 2006.